block magnets: N35-N42-N52,N50M,N48H,N45SH,N40UH,N38EH... Max ... Precise tolerance Neodymium Rare Earth Block Magnets with holes, N35,N38,N40,N42,N45,N48,N50,N52.. Product specifications ... Neodymium rare earth block magnets with different grades of: N35,N38,N40,N42,N45,N48,N50,N52(M,H,SH ... Can be magnetized through thickness,width or length.4. Coatings: Ni, Zn, NiCuNi,epoxy, gold,silver, Cr and so on ...